refactor(payment): centralize route lifecycle

src/lib/payment/payment_search_params.ts

@@ -0,0 +1,32 @@
+import type { PayChannel } from "@/data/dto/payment";
+
+export type PaymentSearchParamValue = string | string[] | undefined;
+export type PaymentSearchParams = Record<string, PaymentSearchParamValue>;
+
+export interface PaymentReturnSearchParams {
+  initialPayChannel: PayChannel | null;
+  shouldResumePendingOrder: boolean;
+}
+
+export function getFirstPaymentSearchParam(
+  value: PaymentSearchParamValue,
+): string | null {
+  return Array.isArray(value) ? (value[0] ?? null) : (value ?? null);
+}
+
+export function parsePaymentPayChannel(
+  value: PaymentSearchParamValue,
+): PayChannel | null {
+  const channel = getFirstPaymentSearchParam(value);
+  return channel === "ezpay" || channel === "stripe" ? channel : null;
+}
+
+export function parsePaymentReturnSearchParams(
+  searchParams: PaymentSearchParams,
+): PaymentReturnSearchParams {
+  return {
+    initialPayChannel: parsePaymentPayChannel(searchParams.payChannel),
+    shouldResumePendingOrder:
+      getFirstPaymentSearchParam(searchParams.paymentReturn) === "1",
+  };
+}